Depends on if you want the best or not You can buy them direct from Losmandy or from Optcorp (who also carry Williams Optics gear). Btw you will want at least the 125mm rings to fit your scope (I have a 4" I use to guide sometimes) but the 160's would be better. The 108's definately won't fit.
Actually, I was thinking of a guidescope for the 4" (WO ZS110 on order), but yes, the Losmandy stuff looks good. I could use the 90mm with a 70 mm guidescope.
I don't know if this will help you or not, attached is a couple of photos of my 4" Tak mounted on a G-11 with an 80mm SW Pro Series as the guidescope.
All mounted on a 12" Casady tandem bar, 12" saddle and H/D BT Technologies dovetail for the Tak, Casady TGAD, Losmandy DUP, Parallax rings and 8" saddle for the 80mm.
An excellent and very stable imaging system.
Cheers
JohnG
PS: The SW ED80 is set like that to get at the finderscope.
John,
nice setup, very nice. How do you align the guidescope? Presumably they are pointed at the same object. I find that with the Losmandy DR125 rings that I can play" around a bit and find a guidestar that is bright enough.
A shame both finders sit to the left.
Gary
To get the finderscope on the ED80 so I could get at it, I rotated the tube 90 degrees, the finder is now on the right, I need it there to get at guidestars using the TGAD, also my crosshairs are aligned so when I centre the guidescope, the target sits in the centre of the ST-4 guider chip.
You many want to think about an old ETX 90 as a guide scope; they're pretty cheap don't weigh much ( mine is 720gms with rings) and are very compact. Oh they also include a free flip mirror!!!!
You many want to think about an old ETX 90 as a guide scope; they're pretty cheap don't weigh much ( mine is 720gms with rings) and are very compact. Oh they also include a free flip mirror!!!!
Merlin how do you find guiding with Mak/Cass...from what I have read it's not that optimal as your adding movement of the Mak primary to the equation.....something that is bad enough to do deal with if your imaging with a SCT then to add this to guiding......I suppose thats why the cheap Acho or even the ED80's are a popular guide scope option.
I would be interested in your thoughts on this Merlin because I once looked at a Mak/Cass for guiding but was put off by all the feedback I have received.
Doesn't appear to be a real issue at the moment; wait till I get more "serious". The only comment Ive seen on MAPUG is re the flip mirror positioning. Very compact and, as I said appears to do the job well.
Keep you posted.
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You can buy them direct from Losmandy or from 
I know what I'm going to be asking for in my xmas hamper 
Along with everything else of course.
